Coil is an advanced movement of the hips, first descrbed by Ted Williams, that maximizes the hips' travel, and thus the Efficiency of a hitter's swing. That allows hitters to hit for both power and average. Coil is most easily seen in the swings of Ted Williams, Roberto Clemente, Bryce Harper, and Fernando Tatis Jr.

Coil was first discussed by Ted Williams in his book The Science of Hitting, where he referrs to it as "Hip Cock." However, for reasons of Internet profanity filters, the movement Ted Williams referred to is now generally referred to as "Coil."

Coil in Hitting

How do you enable a hitter to hit for power while not over-striding and giving up too much distance to the pitcher?

That's the question Coil answers.

I address the topics of Coil, Hip Cock, and Cocking the Hips, in a number of pieces...

• The Secret of Ted Williams' Swing
• Push and Coil, Core, and Push 
• Coiling and Cocking the Hips

Because Coil is such an important concept, I have put together a page that pulls together some of my...

• Favorite Coil Clips

I have also created a couple of drills which are designed to help hitters work on Coiling and Cocking The Hips...

• Ted Williams Drill
• Matt Carpenter Drill